Give a geographical reason for each of the following:

(i) The colour of alluvium varies in different areas.

(ii) Khadar is more fertile than bhangar soil.

(iii) Black soil has a kind of self-ploughing characteristic.

(i) How can you say that soil has evolved over millions of years?

(ii) Name one important constituent of soil that adds fertility to the soil.

Mention any two advantages of alluvial soil.

Give a geographical reason for each of the following:

(i) Different regions in India have different kinds of soil for agriculture.

(ii) Alluvial soils vary in texture.

(iii) Nearly all types of crops grow well in riverine soils.